[gdal-dev] Java API: how to find dimensions of MDArray

[Laurențiu Nicola]

Hi Barry,

I haven't used Java in a while, but those are type signatures as used in JNI. If I recall correctly, (DDDDDLjava/lang/Long;Ljava/lang/Boolean;)V is void f(double p1, double p2, double p3, double p4, double p5, long p6, boolean p6).

They're used to disambiguate overloaded methods.

Laurentiu

PS: I found https://docs.oracle.com/en/java/javase/20/docs/specs/jni/types.html with more details.

On Tue, Jun 6, 2023, at 04:43, Barry DeZonia wrote:
> Even,
> 
> Does this look okay as part of my typemap declaration? It is the only part I am confused about. I am very unfamiliar with this "(DDDDDL...." stuff And the L and V after each parameter. Where can I learn what this stuff means?
> 
> %typemap(argout) (int *nDimensions, GDALDimenion const **pDimensions )
> {
>   const jclass dimensionClass = jenv->FindClass("org/gdal/gdal/Dimension");
>   const jclass vectorClass = jenv->FindClass("java/util/Vector");
>   const jmethodID add = jenv->GetMethodID(vectorClass, "add", "(Ljava/lang/Object;)Z");
>   const jmethodID dimensionCon = jenv->GetMethodID(dimensionClass, "<init>",
>     "(DDDDDLjava/lang/Long;Ljava/lang/Boolean;)V");
> 
>   for( int i = 0; i < *$1; i++ ) {
>     jobject dimensionObj = jenv->NewObject(dimensionClass, dimensionCon,
>                                 &((*$2)[i]),
>                                 true);
>     jenv->CallBooleanMethod($input, add, dimensionObj);
>   }
> }
> 
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